Insulator trolley-conductor clamp



N. J. A. WAHLBERG.

INSULATOR TROLLEY CONDUCTOR CLAMP.

APPLICATIQN men saw. 13, 1919.

1,387,524. PatentedAug. 16,1921."

WITNESSES: INVENTOR /V/'/s Jfl. Wall/bar gm. BY 7 A1T6RNE Y UNITEDSTATES NILS J. A. WAHLBERG, or rrrrsstmen, PENNSYLVANIA, nssronon HOUSEELECTRIC & MANiTFAGTfIRING COMPANY, A

VANIA.

PATENT OFFICE.

, TO WESTING- CORPORATION OF PENNSYL- ,nvsnmron rnotLnY-oolvnuoronCLAMP.

Specification of Letters Patent.

Patented Aug. 16 1921 Application-filed September 13, 1919, "Serial 1T0.323,555.

dent of Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented a new and useful Improvement in InsulatorTrolley-Conductor Clamps, of which the following is a specification.

My invention relates to trolley-conductor supporting and insulatingdevices and particularly to trolley-conductor clamps used in conjunctionwith suspension insulators.

One object of my invention is to provlde a device of the above indicatedcharacter that may be cheaply and expeditiously manufactured, be simpleand durable in construction and be easy to install.

Another object of my invention is to provide a suspension insulator anda trolleyconductor hanger that shall be permanently connected togetherduring the molding or forming operation of the insulating material.

Heretofore, it has been usual to provide suspension insulators andtrolley-conductor hangers as separate devices. This has requiredconsiderable machine workon the devices themselves as well as theprovision of machined extra parts and. subsequent operations ofassembling and installing the several separate parts.

In practising my invention, I provide a suspension insulator and atrolley-conductor clamp that are permanently connected together duringthe forming of the insulating material, thus providing a single struc,

ture having no superfluous or loose parts between the insulator and theclamps, whereby installation thereof is facilitated.

The single figure of the accompanying. drawing is a side view, partiallyin elevation and partially in section, of a device embodying myinvention.

My device comprises, in general, a suspension insulator 1, of a typeusually employed in supporting trolley conductors, and atrolley-conductor clamp or gripping device 2 for engagement with atrolley conductor 3. I r

The specific structure of the clamp 2,

aside from a portion thereof cooperating with the insulator 1constitutes no part of my invention, and will not be described ingreater detail than is necessary to a clear understanding thereof.

The clamp 2 comprises an inverted body member or 'hood a ofsubstantially trough shape for the recept iombetween its sides 5. ofconductor-engaging ears 6 that are moved outwardly at their upper edgesand lnwardly at their lower ed es by a longitudinal wedge 7. The wedge?extends through openings in the ends of the member 4 and,

when driven therethrough to shown in the drawing, moves as abovedescribed, to gripping with the conductor 3.

A projection 8, formed integral with, and disposed at the top of, themember 4, has a head 9 that is located'within the insulator 1. Theinsulator 1 comprises an outer metal sheath or casing 10, having athreaded boss 11 for attachment to a suitable supporting structure (notshown), and a body 12 of insulating material, preferably a composition,molded therein.

During the construction of the device, the outer end of the projection8, having the head 9, is inserted in the casing 10, and the insulatingmaterial 12 is poured or pressed, while ina plastic state, into thecasing and around the projection and head.

After the insulating material 12 becomes hardened, the insulator 1 andthe clamp 2 are permanently secured together.

The arrangement provides a unitary structure having substantially all ofthe the position the ears 6, engagement mechanical advantages of theusually sepa-' rate insulators and clamps, facilitates the handlingthereof and avoids the necessity of assembling the parts 1 and 2 at theplace of installation While I have shown and described a particular formof my invention, changes may be effected therein without departing fromthe spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. In a conductor insulating support, the combination with an insulatorcomprising a metal supporting hood and an insulating memberdisposedthereunder to be protected thereby, of a conductor clamp comprising ametal member having an elongated portion extending parallel to theconductor and an integral headed shank on the elongated portion forcooperative holding relation to said insulating member.

2. In a device for supporting and insulating a trolley conductor, thecombination With an insulator comprising a metal supporting hood and abody of insulating material formed and related to the hood to beentirely protected from above thereby, of a conductor clamp comprising ametal member extending along the conductor and having an integralportion for interlocking re lation to said insulating material.

3. In a device for supporting and insulating a trolley conductor, thecombination with an insulator comprising a metal supporting casing ofsubstantially inverted cup-v shape, and a body of molded insulatingmaterial disposed entirely therein, of a conductor clamp comprising ametal member extending along the conductor and having an integral headedshank embedded in said insulating material. v

4. In a conductor insulating support, the combinationwith an insulatorcomprising a metal supporting casing of substantially inverted cup-shapeand a body of molded insulating material disposed entirely Within thecasing, of a conductor clamp comprising an elongated metal memberextending along the top of the conductor in substantially parallelrelation thereto and having an integral headed portion projecting froman intermediate position thereof into said molded material; I

In testimony whereof, I have hereunto subscribed my name this 26th dayof Aug,

NILS J. A. WAHLBERG.

